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68445 = 345132
BaseRepresentation
bin10000101101011101
310110220000
4100231131
54142240
61244513
7403356
oct205535
9113800
1068445
1147473
1233739
1325200
141ad2d
1515430
hex10b5d

68445 has 30 divisors (see below), whose sum is σ = 132858. Its totient is φ = 33696.

The previous prime is 68443. The next prime is 68447. The reversal of 68445 is 54486.

It can be divided in two parts, 684 and 45, that added together give a 6-th power (729 = 36).

It is an interprime number because it is at equal distance from previous prime (68443) and next prime (68447).

It can be written as a sum of positive squares in 3 ways, for example, as 324 + 68121 = 18^2 + 261^2 .

It is not a de Polignac number, because 68445 - 21 = 68443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68443) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5259 + ... + 5271.

268445 is an apocalyptic number.

68445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68445 is a deficient number, since it is larger than the sum of its proper divisors (64413).

68445 is a wasteful number, since it uses less digits than its factorization.

68445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43 (or 21 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 68445 is about 261.6199533675. The cubic root of 68445 is about 40.9053936052.

The spelling of 68445 in words is "sixty-eight thousand, four hundred forty-five".

Divisors: 1 3 5 9 13 15 27 39 45 65 81 117 135 169 195 351 405 507 585 845 1053 1521 1755 2535 4563 5265 7605 13689 22815 68445